wanna a practical and check valve? If you want, then you can consider our product.This check valve is made from , not easy to break and damage, very and practical. For personal hood use or dining room use. The product is simple and convenient to use, easy to install and remove. The product has practical functions. Features - Color: Silver -Material:Stainless Steel - Size: 18.50X18.50X4.20cm/7.27X7.27X1.65in - Size(Clamp): 55.00X1.20X1.00cm/21.61X0.47X0.39in -Note:150 represents a that fits 150mm inside diameter - Made of , and for your families. Simple design makes it for outdoor environment use. - Easy to install. The check valve can prevent rain more effectively with the special design. - Ensure the amount of smoke exhaust, so that the smoke airflow fast exhaust. - workmanship and sturdy materials ensure a and perfect details. - and easy to clean, reusable and can be used for a long term. Package list: 1 x Check Valve 1 Clamp